Definition of I couldn't tell you
- "Do you know where the library is?" "I'm sorry. I couldn't tell you."
: the 9th letter of the English alphabet
: a graphic representation of this letter
: a speech counterpart of orthographic i
: someone aware of possessing a personal individuality : self
used as a connective vowel to join word elements especially of Latin origin
: could not
: to relate in detail : narrate
: to give utterance to : say
: to make known : divulge, reveal
: an inadvertent behavior or mannerism that betrays a poker player's true thoughts, intentions, or emotions
: hill, mound
What made you want to look up I couldn't tell you? Please tell us where you read or heard it (including the quote, if possible).